Add vim-splitjoin

gS --> split
gJ --> join
Add merge summary automatically
Abolish some!
Remove ftplugin/tex.vim which didn't really work anyway
Remove latex-suite

Let's see if I can live without this. There must be other/better ways of
optimising vim for latex work.
Add trailertrash as a submodule

(It was previously added 'manually'.)
Config surround.vim for latex cmds
Let's try latex-box
Add snipmate